Feel like it depends on what appeals to you most when you think of ctb. I'm going for a playlist of 2000s hits: pop, rock, metal, mostly artists everyone's heard of, because I want to go through memories. I want to be thinking about the best of my life and those times that were nostalgic. But you might want some calming music to induce sleep and a lack of sense and mind? Or maybe loud, hard rock, scream metal to drown it all out, bring out the emotions as you go?